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Ultra-short-focus projection optical system and projection equipment

A technology of projection optical system and ultra-short focus, applied in optics, optical components, instruments, etc., can solve problems such as small aperture

Pending Publication Date: 2021-11-02
UNION OPTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to propose an ultra-short-focus projection optical system and projection equipment, aiming at solving the problem of the small aperture of the existing ultra-short-focus projection optical system

Method used

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  • Ultra-short-focus projection optical system and projection equipment
  • Ultra-short-focus projection optical system and projection equipment
  • Ultra-short-focus projection optical system and projection equipment

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0030] It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second" and ...

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Abstract

The invention discloses an ultra-short-focus projection optical system. The system comprises a display unit, a first lens group with positive focal power, a second lens group with positive focal power, a third lens group with negative focal power and an aspheric reflector which are sequentially arranged along a projection direction. The first lens group comprises a first lens, a second lens and a diaphragm which are sequentially arranged along the projection direction, the first lens is a glass aspheric lens, the second lens is a glass spherical lens, and the first lens and the second lens are respectively and gradually bent towards the diaphragm direction from the center to the periphery of the first lens and the periphery of the second lens. The ultra-short-focus projection optical system and the projection equipment provided by the invention have the advantage of high resolution while meeting the requirement of large aperture.

Description

technical field [0001] The invention relates to the technical field of projection equipment, in particular to an ultra-short-focus projection optical system and projection equipment. Background technique [0002] In recent years, with the development of projection technology, projection equipment has been widely used in household, education, office and other fields. Among them, the ultra-short-throw projector can be better used in a compact space because it projects a large picture at a short distance. favored by the environment. As the core component of an ultra-short-throw projector, the ultra-short-throw projection optical system is expensive. In order to reduce costs, the existing ultra-short-throw projection optical system generally has an aperture value above 2.5 and a small aperture. Contents of the invention [0003] The main purpose of the present invention is to provide an ultra-short-focus projection optical system and projection equipment, aiming at solving th...

Claims

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Application Information

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IPC IPC(8): G03B21/14G03B21/00G02B13/18G02B13/00
CPCG03B21/142G02B13/0045G02B13/006G02B13/18G03B21/008G02B13/24G03B21/53G03B21/28H04N9/31
Inventor 李源财全丽伟李守林王浩
Owner UNION OPTECH
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